STAT3 and gastric cancer: As shown in Fig 4, in terms of predicting survival in postoperative GC patients, AUCs are 0.663 for IL-6, 0.601 for p-Stat3, and 0.593 for PD-L1, respectively, indicating that IL-6, p-Stat3 and PD-L1 have power (ability) in predicting survival prognosis for GC patients.